Abstract
We calculate the frequency-dependent admittance of a diode with a two-dimensional electron channel in a slot between strip-like contacts. Hydrodynamic electron transport equations coupled with a two-dimensional Poisson equation for the self-consistent electric potential are used. Using the calculated expression for the admittance, we analyze the effect of the planar contacts and external capacitance on the plasma oscillations in the system under consideration. The obtained results are useful for the interpretation of experimental observation of plasma effects in high-electron mobility transistors and optimization of terahertz devices based on these transistors.
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